9GAY

Extended phiCD508 capsid

Summary for 9GAY

• Entry DOI: 10.2210/pdb9gay/pdb
• EMDB information: 51191
• Descriptor: gp49 - Major capsid protein, gp48 - Minor capsid protein (2 entities in total)
• Functional Keywords: bacteriophage, virus, capsid
• Biological source: Clostridioides difficile; More
• Total number of polymer chains: 14
• Total formula weight: 372226.51

Authors

Wilson, J.S.,Fagan, R.P.,Bullough, P.A. (deposition date: 2024-07-29, release date: 2025-03-26, Last modification date: 2025-04-09)

Primary citation

Wilson, J.S.,Fortier, L.C.,Fagan, R.P.,Bullough, P.A.
Molecular mechanism of bacteriophage contraction structure of an S-layer-penetrating bacteriophage.
Life Sci Alliance, 8:-, 2025

PubMed Abstract: The molecular details of phage tail contraction and bacterial cell envelope penetration remain poorly understood and are completely unknown for phages infecting bacteria enveloped by proteinaceous S-layers. Here, we reveal the extended and contracted atomic structures of an intact contractile-tailed phage (φCD508) that binds to and penetrates the protective S-layer of the Gram-positive human pathogen The tail is unusually long (225 nm), and it is also notable that the tail contracts less than those studied in related contractile injection systems such as the model phage T4 (∼20% compared with ∼50%). Surprisingly, we find no evidence of auxiliary enzymatic domains that other phages exploit in cell wall penetration, suggesting that sufficient energy is released upon tail contraction to penetrate the S-layer and the thick cell wall without enzymatic activity. Instead, the unusually long tail length, which becomes more flexible upon contraction, likely contributes toward the required free energy release for envelope penetration.

PubMed: 40139691
DOI: 10.26508/lsa.202403088

Experimental method

ELECTRON MICROSCOPY (3.74 Å)